gtx 980/ti/970 pricew are falling, due gtx 1080 cards and his "potential" performance and new price.
Nvidia killing their own cards since ....
This happens every time a company releases a new iteration of a product. It's not intentional, it's just the progression of technology. Nvidia, AMD, Intel, Corsair, Samsung, literally every technology company does this, and it's really not driven by the company but rather by the consumers.